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Vulnerability record · CVE-2026-27821 · published 26 February 2026

CVE-2026-27821: Gpac stack-based buffer overflow vulnerability

Gpac · Gpac

GPAC is an open-source multimedia framework. In versions up to and including 26.02.0, a stack buffer overflow occurs during NHML file parsing in `src/filters/dmx_nhml.c`. The value of the xmlHeaderEnd XML attribute is copied from att->value into szXmlHeaderEnd[1000] using strcpy() without any length validation. If the input exceeds 1000 bytes, it overwrites beyond the stack buffer boundary. Commit 9bd7137fded2db40de61a2cf3045812c8741ec52 patches the issue.

7.7 CVSS 4.0 High EPSS 0.40% · top 68.0% CWE-121 · Stack-based buffer overflow
7.7CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

GPAC is an open-source multimedia framework. In versions up to and including 26.02.0, a stack buffer overflow occurs during NHML file parsing in `src/filters/dmx_nhml.c`. The value of the xmlHeaderEnd XML attribute is copied from att->value into szXmlHeaderEnd[1000] using strcpy() without any length validation. If the input exceeds 1000 bytes, it overwrites beyond the stack buffer boundary. Commit 9bd7137fded2db40de61a2cf3045812c8741ec52 patches the issue.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gpac/gpac/commit/9bd7137fded2db40de61a2cf3045812c8741ec52 Patch
https://github.com/gpac/gpac/security/advisories/GHSA-q7qh-8r2r-q559 ExploitVendor Advisory
https://github.com/gpac/gpac/security/advisories/GHSA-q7qh-8r2r-q559 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46427Gpac null pointer dereference vulnerabilityAn issue was discovered in gpac version 2.3-DEV-rev588-g7edc40fee-master, allows remote attackers to execute arbitrary code, cause a denial of servic…EPSS 1.1%9.8CVE-2024-0321Gpac stack-based buffer overflow vulnerabilityStack-based Buffer Overflow in GitHub repository gpac/gpac prior to 2.3-DEV.EPSS 1.0%9.8CVE-2023-46932Gpac out-of-bounds write vulnerabilityHeap Buffer Overflow vulnerability in GPAC version 2.3-DEV-rev617-g671976fcc-master, allows attackers to execute arbitrary code and cause a denial of…EPSS 1.1%9.8CVE-2023-2840Gpac null pointer dereference vulnerabilityNULL Pointer Dereference in GitHub repository gpac/gpac prior to 2.2.2.EPSS 0.65%9.8CVE-2022-36190Gpac use after free vulnerabilityGPAC mp4box 2.1-DEV-revUNKNOWN-master has a use-after-free vulnerability in function gf_isom_dovi_config_get. This vulnerability was fixed in commit …EPSS 1.1%9.8CVE-2022-1795Gpac use after free vulnerabilityUse After Free in GitHub repository gpac/gpac prior to v2.1.0-DEV.EPSS 1.0%9.8CVE-2021-28300Gpac null pointer dereference vulnerabilityNULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or caus…EPSS 2.1%9.8CVE-2020-11558Gpac use after free vulnerabilityAn issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box. audio_sample_entry_Read in isomedia/box_code_base.c does not properly …EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2026-27821), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.